IV. 



Oil-bodies, 41. 

 Oil, 49. 



Oogoiiia, 34, 3o. 

 Oophyte, 49, 52, 55. 

 Oosphere, 36, 45, 62, 73. 

 Oospore, 37. 

 Operculum, 51, 

 Ordinary cell division, 26. 

 Osteole, 34. 

 Ovum, 36, 45. 53, 62, 73. 



Packing-tissue, 32. 

 FalisHde parenchyma, 68. 

 Papillae, 10. 



Paraphyses, 15, 21, 43, 52. 

 Parasite.s. 16 

 Parasitism, 16. 

 Par me ha, 17. 

 Parenchyma, 57, 68. 

 Pedicel, 5, 42. 

 Perichoetial, 52. 

 Perichoetium, 44. 

 Pericycle, 58, 67, 69. 

 Perigonial, 53. 

 Perigyninin, 48, 

 Peristome. 54. 

 Perithc'cium. 11, 12. 



Petioles, 76. 



Pheeophyll, 31. 



Phloem, 52, 57, 67. 



Phycnxantheine, 31 



Pileus. 13. 



Pilifery, 58, 69. 



Pdobolus, 6. 



Pith, 66. 



Pollinodium, 10. 



Priraary- tissue, 33. 



Proteid.s, 1. 



Protein, 1. 



Protococcacese, 24. 



Protococcus Atlanticus, 26. 

 ,, nivalis, 26. 



,, pluviaUs,24:, 26. 



Changes to active condition, 

 25; Encysted condition, 24; 

 Changes tc encysted con- 



dition, 25 ; Reproduction 



of, 26 

 Protonema, 50, 51. 

 Protophloem, 67- 

 Protoplasm, 1. 

 ProthalUum, 62, 72. 

 Protoxy'ism, 68. 

 Pseud- axis, 31. 

 Pseudo-parenchyma, 11, 17. 

 Pyrenoids, 27. 



Ramenta, 65. 

 Red snow, 26. 

 Respiration, 18, 

 Rhizoids, 38, 41. 

 Rhizophores, 56, 

 Root cap, 69. 

 Root-hairs, 69, 75. 

 Roots, 66, 75. 

 Rootstock, 65. 



Saccharomycetes, 1 . 



Saccharomyces cerevisicB, 1. 



Scalariform tracheides, 68. 



Scales, 41. 



Sclerenchyma, 66. 



Scorpioid, 31. 



Secondary tissue, 53. 



Selaginellse, 56, 



Selaginella martensii, 56. 



Anatomy of, 56 ; Develop- 

 ment of archegonia, 62 ; 

 Fertilization, 63 , Germin- 

 ation, 60 ; Growth, 56 ; 

 Habit, 56 ; Leaves, 58 ; 

 Morphology, 56 ; Repro- 

 duction of, 58 ; Root, 58 ; 

 Stem, 56. 



Seta, 47, 53. 



Sieve tubes, «57, 67. 



Sori, 71. 



Spermatia, 20. 



Spermatozoids, 44. 



Spermatozoid mother cells, 60. 



Spermogonia, 20. 



